Toews Agility Shares Dynamic Tactical Income ETF Allocation Risk [Member] Derivatives Risk [Member] Etf Underlying Fund Risk [Member] Etf Structure Risk [Member] Not Individually Redeemable [Member] Trading Issues [Member] Liquidity Risk [Member] Cash Transaction Risk [Member] Market Price Variance Risk [Member] Fixed Income Risk [Member] Fluctuation Of Net Asset Value Risk [Member] Foreign Securities Risk [Member] Futures Risk [Member] High Yield Bond Risk [Member] Investmentgrade Corporate Bonds [Member] Issuer Risk [Member] Management Risk [Member] Market And Geopolitical Risk [Member] Options Risk [Member] Portfolio Turnover Risk [Member] Toews Agility Shares Dynamic Tactical Income ETF Morningstar US Core Bond Index Bloomberg Barclays Aggregate Bond Index Toews Agility Shares Dynamic Tactical Income ETF [Default Label]